Can a backwards compatible PCI Express 2.0 motherboard vary on how well the card it is using performs?

Not sure how to word the title right, but I'm getting a Radeon R9 270x 4GB 256-bit GDDR5, And I have an Asus M5A97 motherboard. The card is PCI express 3.0 and the motherboard is PCI express 2.0. My question is, the motherboard is backwards compatible, so can the amount of frames I lose differ? I know it's nothing big, like 1-2 frames, but can the card vary how many frames will be lost? I'm horrible at wording things properly, so sorry if it is confusing :p

- Ryan
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More about backwards compatible pci express motherboard vary card performs
  1. Any video card that uses the PCIe 3.0 standard will work in a motherboard with PCIe 2.0 slots. They are fully backwards compatible.
    As for how many frames you might lose, you shouldn't see any difference in performance. I have yet to see a graphics card that can fully saturate the PCIe 2.0 bus. PCIe 3.0 was developed for future graphics cards that may actually need the bandwidth. That's why there are so few motherboards with PCIe 3.0 right now. Its simply not needed yet.
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